Selection Techniques of Machine Vision Telecentric Lenses

In the field of machine vision, the selection of telecentric lenses is crucial for system performance. Proper selection can not only improve image quality but also enhance detection accuracy and efficiency. Here are some selection tips to help you make informed decisions when using machine vision telecentric lens.

Analyzing the Conditions for Using Machine Vision Telecentric Lens

When selecting machine vision telecentric lens, it is very important to understand the applicable conditions. Firstly, telecentric lenses show significant advantages when the object to be inspected has a certain thickness (thickness >1/10FOV diameter). Secondly, if the measured objects are not on the same plane or their distance to the lens is not clear,  machine vision telecentric lens can provide more consistent imaging quality. Additionally, when inspecting objects with apertures or three-dimensional shapes, telecentric lenses can effectively reduce image distortion and ensure consistent image brightness. Finally, if defects can only be detected under parallel illumination in the same direction, using telecentric lenses will significantly enhance detection effectiveness.

Matching the Target Surface and Choosing the Interface for Machine Vision Telecentric Lens

When selecting machine vision telecentric lens, matching the target surface is crucial. Camera target surfaces generally come in various sizes such as 1/3”, 1/2”, 2/3”, and 35mm full-frame. When selecting a lens, it should be ensured that the lens's imaging size is greater than or equal to the camera's chip specification, with the best case being they are equal. If the lens size is smaller than the camera, it may result in vignetting, affecting image quality. Furthermore, interface matching is an important step in selection. Different manufacturers and different target surfaces will have different interface specifications, such as C mount, F mount, etc., ensuring the camera and lens interfaces match is a basic prerequisite for installation.

Precision Matching and Performance Considerations for Machine Vision Telecentric Lens

In machine vision applications, precision matching is a key factor. Typically, vision projects have clear precision requirements, which are the result of both hardware and software performance. In the initial selection stage, attention should be given to the precision achievable by the lens and camera. Hardware precision can be evaluated by calculating the length of the camera pixel and the magnification of the lens. Telecentric lenses generally indicate magnification in their parameters, which is especially important for precision calculations. If a fixed focal length lens is selected, magnification calculations based on different working distances are needed to ensure the project's precision requirements are met. Moreover, to achieve high-precision vision projects, software algorithms are often needed for correction and optimization.

Overall, selecting machine vision telecentric lens requires comprehensive consideration of applicable conditions, target surface matching, interface selection, and precision requirements. Understanding these selection tips can help find the appropriate lens for various application scenarios, improving detection efficiency and precision. Whether for industrial automation, product inspection, or precise measurement, the right telecentric lens is the key to achieving excellent machine vision systems.